Any public-school student who, after a hearing, is determined to have brought a weapon to school shall be suspended for a period of not less than one calendar year. Additionally, the child may be charged with a criminal offense and referred for a juvenile delinquency or juvenile offender proceeding. It is a class E felony to possess a weapon on school grounds. A weapon includes a rifle, shotgun, or firearm. School grounds include any buildings or grounds used for educational purposes, or on a school bus.